How to Update Firmware on a Mac OS X

Click the Apple menu and select 'Software Update' from the drop-down menu. This launches the App Store and automatically sends you to the Updates section. Provide an administrator username and password, if you receive a prompt requesting the information.
Click the 'More' button next to any OS X Update package in the Update section and read the update description to see if any OS X Update packages contain the latest firmware.
Select the 'Update' button next to any options that contain firmware updates. Alternatively, click the 'Update All' button to update all available software. You may need to provide your administrator username and password again.
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